Sub-bass sounds are the deep, low-register pitches below approximately 70 Hz (C₂ in

scientific pitch notation Scientific pitch notation (SPN), also known as American standard pitch notation (ASPN) and international pitch notation (IPN), is a method of specifying musical Pitch (music), pitch by combining a musical Note (music), note name (with accidental ( ...

) and extending downward to include the lowest frequency humans can hear, approximately 20 Hz (E₀). In this range, human hearing is less sensitive, so these notes tend to be felt more than heard. The low E-string on a

bass guitar The bass guitar (), also known as the electric bass guitar, electric bass, or simply the bass, is the lowest-pitched member of the guitar family. It is similar in appearance and construction to an Electric guitar, electric but with a longer nec ...

is usually tuned to 41.2 Hz, while the lowest note on a standard

piano A piano is a keyboard instrument that produces sound when its keys are depressed, activating an Action (music), action mechanism where hammers strike String (music), strings. Modern pianos have a row of 88 black and white keys, tuned to a c ...

is A at 27.5 Hz.

Sound reinforcement system A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in Loudspeaker enclosure, enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also ...

s and PA systems often use one or more subwoofer loudspeakers to amplify sounds in the sub-bass range. Sounds below sub-bass are

infrasound Infrasound, sometimes referred to as low frequency sound or incorrectly subsonic (subsonic being a descriptor for "less than the speed of sound"), describes sound waves with a Audio frequency, frequency below the lower limit of human audibility ...

Hearing and usage

20 Hz is considered the normal low-frequency limit of human hearing. When pure sine waves are reproduced under ideal conditions and at very high

decibel The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a Power, root-power, and field quantities, power or root-power quantity on a logarithmic scale. Two signals whos ...

s, a human listener will be able to identify tones as low as 12 Hz (G_–1). Audio tracks known as bass tests use sub-bass frequencies which are used to test or to demonstrate the capabilities of audio equipment. High-end subwoofers can accurately reproduce sound to about 18 Hz ±2 dB. Sub-bass is popular in

dance music Dance music is music composed specifically to facilitate or accompany dancing. It can be either a whole piece or part of a larger musical arrangement. In terms of performance, the major categories are live dance music and recorded dance musi ...

, where the low frequencies are produced by the kick drum (bass drum), the

and electronic

synthesizer A synthesizer (also synthesiser or synth) is an electronic musical instrument that generates audio signals. Synthesizers typically create sounds by generating waveforms through methods including subtractive synthesis, additive synthesis a ...

s and

drum machine A drum machine is an electronic musical instrument that creates percussion sounds, drum beats, and patterns. Drum machines may imitate drum kits or other percussion instruments, or produce unique sounds, such as synthesized electronic tones. A d ...

s. Particular genres such as

house music House is a genre of electronic dance music characterized by a repetitive Four on the floor (music), four-on-the-floor beat and a typical tempo of 115–130 beats per minute. It was created by DJs and music producers from Chicago's underground ...

drum and bass Drum and bass (commonly abbreviated as DnB, D&B, or D'n'B) is a genre of electronic dance music characterised by fast Break (music)#Breakbeat (element of music), breakbeats (typically 165–185 Tempo, beats per minute) with heavy Bass (music) ...

and

dubstep Dubstep is a genre of electronic dance music that originated in South London in the early 2000s. The style emerged as a UK garage offshoot that blended 2-step rhythms and sparse dub production, as well as incorporating elements of broken ...

often feature a

bassline Bassline (also known as a bass line or bass part) is the term used in many styles of music, such as blues, jazz, funk, Dub music, dub and electronic music, electronic, traditional music, traditional, and classical music, for the low-pitched P ...

that consists mainly of sub-bass frequencies. Much

experimental music Experimental music is a general label for any music or music genre that pushes existing boundaries and genre definitions. Experimental compositional practice is defined broadly by exploratory sensibilities radically opposed to, and questioning of, ...

uses sub-bass, in particular

drone music Drone music, drone-based music, or simply drone, is a minimalist genre of music that emphasizes the use of sustained sounds, notes, or tone clusters called '' drones''. It is typically characterized by lengthy compositions featuring relativel ...

, where the majority of the sound can often be in the sub-bass range. Often,

hip hop Hip-hop or hip hop (originally disco rap) is a popular music genre that emerged in the early 1970s from the African-American community of New York City. The style is characterized by its synthesis of a wide range of musical techniques. Hip- ...

and rap songs feature prevalent sub-bass. The

pedal keyboard A pedalboard (also called a pedal keyboard, pedal clavier, or, with electronic instruments, a bass pedalboard) is a musical keyboard, keyboard played with the feet that is usually used to produce the low-pitched bass line of a piece of music. A p ...

range on

pipe organ The pipe organ is a musical instrument that produces sound by driving pressurised air (called ''wind'') through the organ pipes selected from a Musical keyboard, keyboard. Because each pipe produces a single tone and pitch, the pipes are provide ...

s also often extends into the sub-bass range; the bottom note of a 16′ stop is typically tuned to 32 Hz (C₁), a 32′ stop at 16 Hz (C₀).

References

{{Range (music) Bass (sound) Pitch (music)